[Ti] iChat v Yahoo! Messenger

[Dr. Trevor J. Hutley]

At 18:34 -0400 20/4/05, Alan Thompson wrote:
>Perhaps iChat does not "protocol hop" like the Yahoo! IM client 
>does.  It's really difficult to block IM on your network - you can't 
>simply block outgoing traffic on the popular IM UDP ports - the 
>clients will try to just use another port, most likely port 80 - 
>which is typically open for web traffic.  Do you use a proxy server 
>for anything while you are in Saudi?
>On Apr 20, 2005, at 6:27 PM, Dr. Trevor J. Hutley wrote:
>
>>I have never been able to get iChat to work from here in Saudi Arabia.
>>I downloaded Yahoo! Messenger for OS X, launched it, and it worked 
>>straight away..........
>>
>>Does anyone have any idea about the workings of iChat and Yahoo! 
>>Messenger, that could explain this unexpected result?

Alan - my ISP (I could change, as there is no subscription basis) is 
now SaudiNet.  I have used about 5 differnet ISP so far, without any 
difference as far as iChat is concerned.

I use PROXY.SAUDI.NET.SA:8080 for my proxy.

>Perhaps iChat will not try to do this, and will only try to 
>communicated on specific designated ports?
       iChat uses Port 5190 (the Prefs say) to connect to the AIM 
server login.oscar.aol.com

regards,  Trevor